After years in which there were only minor Avidemux updates, there's finally a new major release: 2.6, which comes with a rewrite of all the Avidemux internals as well as some new features:

Support for hardware accelerated framework: VDPAU only for the moment

OpenGl filters (only Qt4/mac & linux)

Support for more scripting languages: Spidermonkey, TinyPy and QtScript

Multiple audio tracks support (in / out)

Deal with time and not assume constant framerate. You can now edit your .ts and keep a/v sync

Install Avidemux 2.6 in Ubuntu

Ubuntu 12.04 users can install the latest Avidemux 2.6 without overwriting Avidemux 2.5.x (if installed), by using the GetDeb repository. Firstly, you have to add the GetDeb repository by installing THIS deb file. Once installed, run the following commands in a terminal:

sudo apt-get update
sudo apt-get install avidemux2.6

For other Linux distributions, Windows and Mac OS X, see the Avidemux downloads page.